Porting

moos500 · 08-01-2008, 01:55 PM

Lately, I have been hearing the phrase "porting your intake", and "porting your heads". Being kinda of person i am i try to find it out as soon as possible. I have gathered some information on it, but i really want to know more. I want to know what exactly it means and what are the advantages of doing these tasks. I figured this would be the place to go seeing that most everyone on here are avid car enthusiasts.

DJJSR · 08-01-2008, 04:02 PM

Most conventional engines are somewhat restrictive in the intake manifold and cylinder head passages (aka ports). "Porting" is when you get in there with either a milling machine or hand held grinder and cut away some of the metal, thus making the passages larger, smoother and possibly a little different shape.

This usually results in better flow of the air/fuel mixture going into the cylinder and the exhaust gases coming out of the cylinder. I said "usually" because I have seen some porting jobs done by inexperienced people that have had very negative results. It's not a job for the novice and even experienced machine shops can screw it up if they don't know what they're doing.

There's a lot of factors that must be considered, such as CFM of the carb or throttle body, cu. in. displacement, camshaft lift and duration, compression ratio, RPM range, etc.

If you're considering getting it done, find a shop with a flowbench for testing and that has experience with the S2000 motor and PROVEN results on a dyno. From what I've read, the Honda engineers have a near perfect design in stock form for a normally aspirated streetable motor, so I'm not sure if there's much to be gained.

appleade280 · 08-01-2008, 04:54 PM

wow that was the best description ever!

great job djjsr

08-01-2008, 01:55 PM	#1 (permalink)
moos500 Member Join Date: Jun 2008 Posts: 56	Porting Lately, I have been hearing the phrase "porting your intake", and "porting your heads". Being kinda of person i am i try to find it out as soon as possible. I have gathered some information on it, but i really want to know more. I want to know what exactly it means and what are the advantages of doing these tasks. I figured this would be the place to go seeing that most everyone on here are avid car enthusiasts.

08-01-2008, 04:02 PM	#2 (permalink)
DJJSR Philosopher Join Date: Sep 2007 Location: Hooterville Posts: 1,751	Most conventional engines are somewhat restrictive in the intake manifold and cylinder head passages (aka ports). "Porting" is when you get in there with either a milling machine or hand held grinder and cut away some of the metal, thus making the passages larger, smoother and possibly a little different shape. This usually results in better flow of the air/fuel mixture going into the cylinder and the exhaust gases coming out of the cylinder. I said "usually" because I have seen some porting jobs done by inexperienced people that have had very negative results. It's not a job for the novice and even experienced machine shops can screw it up if they don't know what they're doing. There's a lot of factors that must be considered, such as CFM of the carb or throttle body, cu. in. displacement, camshaft lift and duration, compression ratio, RPM range, etc. If you're considering getting it done, find a shop with a flowbench for testing and that has experience with the S2000 motor and PROVEN results on a dyno. From what I've read, the Honda engineers have a near perfect design in stock form for a normally aspirated streetable motor, so I'm not sure if there's much to be gained. __________________ Don Last edited by DJJSR : 08-01-2008 at 04:05 PM.

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08-01-2008, 04:54 PM	#3 (permalink)
appleade280 Member Join Date: Nov 2007 Location: MN Posts: 54	wow that was the best description ever! great job djjsr